Sprinkler nozzle

ABSTRACT

The present invention relates to an improved sprinkler nozzle for a simple sprinkling device for the purpose of irrigation of vegetables, flowers, trees growing in a green house.

a n llniie Slaies aleni [1 1 [111 3,797,765 Salsho ar. 19, 1974 SPRINKLER NOZZLE 1,499,072 6/1924 Pleister 85/84 3,606,814 9/1971 MacKenzie 85/84 [75] Invent said, Japan 2.877.682 3/1959 Barry et al. 85/84 73 Assignee; K F Co" Ltd Yokohama 3.361.363 1 1/1968 Babington 239/547 X W Japan FOREIGN PATENTS OR APPLICATIONS [22] Filed: Nov. 21, 1972 667,637 7/1963 Canada 85/84 [21] AP 1 N 308 351 1,346,754 12/1963 France....

Primary Examiner-Allen N. Knowles [52] US. Cl 239/547, 239/550, 239/552, Assistant Examiner-John J. Love 239/600, 85/84 Attorney, Agent, or Firm-Blum, Moscovitz, Friedman [51] Int. Cl B05b 1/20 & Kaplan [58] Field of Search 239/547, 550, 552, 518,

239/600; 85/84, 72 57 ABSTRACT 56] References (med The present invention relates to an improved sprinkler nozzle for a simple sprinkling device for the purpose UNITED STATES PATENTS of irrigation of vegetables, flowers, trees growing in a 2,628,865 2/1953 Duncan, Jr. 239/547 X green h 8 2,898,798 8/1959 Carno 85/84 3,203,304 8/1965 Rapata 85/84 X 10 Claims, 32 Drawing Figures PATENTEDHAR 1 9 1914 3.797" 755 SHEEI 2 0F 3 F1619 FIG.2O

BACKGROUND OF THE INVENTION As shown in FIGS. 1 and 2 of the accompanying drawings, the conventional sprinkler nozzle for a simple sprinkler C, is mounted on synthetic resin water distribution pipe b, arranged along each furrow. The nozzle C was fitted to the water distribution pipe b by threadedly engaging the lower portion C of the nozzle C externally threaded with the internally threaded portion d of the water pipe b. In most cases, good skills and much time were required to cut regularly pitched internal threads d on the inside of the water distribution pipe, and such thread cutting was expensive. It is also troublesome to threadedly engage the externally threaded portion C of the sprinkler nozzle C with the internally threaded portion d of the water distribution pipe b.

To avoid the trouble to threadedly engage a sprinkler nozzle with a water pipe, it was known in the art to fit a non'threaded cylindrical part of the sprinkler nozzle in a hole arranged on a water pipe. However, this arrangement had the vital disadvantage that the sprinkler nozzle was popped out by water pressure in the water pipe.

SUMMARY OF THE INVENTION The present invention eliminates the above disadvantages completely. It is one object of the present invention to provide an improved sprinkler nozzle which can be easily and surely fitted to the wall of a water pipe in a short time at low cost.

It is another object of the present invention to provide a sprinkler nozzle of simple construction consisting of fewer parts.

Still other objects and advantages of the invention will in part be obvious and will in part be apparent from the specification.

The invention accordingly comprises an article of manufacture possessing the features, properties, and the relation of elements which will be exemplified in the article hereinafter described, and the scope of the invention will be indicated in the claims.

BRIEF DESCRIPTION OF .THE DRAWINGS For a fuller understanding of the invention, reference is bad to the following description taken in connection with the accompanying drawings, in which:

FIG. 1 is a sectional view of prior art sprinklers provided with the conventional sprinkler nozzles, which are arranged in furrows;

FIG. 2 is a front viewof the conventional sprinkler nozzle mounted on a water pipe;

FIG. 3 is an exploded front view of the sprinkler nozzle according tothe present invention;

FIG. 4 is a bottom view of the rivet shown in FIG. 3;

FIG. 5 is a sectional view of the sprinkler nozzle according to the present invention fitted to awater pipe, taken along the line A-A in FIG. 3 viewed in the direction of the arrow;

FIG. 6 is a front view of another embodiment of a pin forming a part of a nozzle assembly;

I FIG. 7 is a sectional view taken along the line B-B of FIG. 6, viewed in the direction of the arrow;

FIG. 8 is a sectional view of a sprinkler nozzle employing a pin shown in FIG. 6;

FIG. 9 is a sectional view taken along the line C--C of FIG. 8;

FIGS. 10 and 11 are front views of additional embodiments of a pin;

FIG. 12 is a sectional view of a sprinkler nozzle using the pin shown in FIG. 10;

FIG. 13 is a sectional view taken along the line D-D of FIG. 10, viewed in the direction of the arrow;

FIG. I4 is a partial front view showing another shape of the tip of the pin shown in FIGS. 1 through 12;

FIGS. 15, 17 and 18 are front views of the further embodiments of the pin;

FIG. 16 is a sectional view of a sprinkler nozzle employing the pin shown in FIG. 15;

FIG. 19 is a sectional view of the sprinkler nozzle shown in FIG. 15 taken along the line E-E, viewed in the direction of the arrow;

FIG. 20 is a partial front view of another shape of the tip of the pin shown in FIG, 15 through FIG. 18;

FIGS. 21 and 22 are sectional views of another rivet to be combined with the various pins;

FIG. 23 is an exploded front view of another embodiment of the sprinkler nozzle according to the present invention;

FIG. 24 is a bottom view of the rivet shown in FIG. 23;

FIG. 25 is a sectional view of the sprinkler nozzle shown in FIG. 23 taken along the line FF, viewed in the direction of the arrow;

FIG. 26 is a sectional view showing the assembly of the sprinkler nozzle shown in FIG. 23 to a water pipe;

FIG. 27 is a front view of another embodiment of the rivet;

FIG. 28 is a partial, exploded front view of the sprinkler nozzle according to the present invention employing another embodiment of the rivet;

FIG. 29 is a bottom view of the rivet shown in FIG. 28;

FIG. 30 is a sectional view taken along the line GG of FIG. 28;

FIG. 31 is a front view of another embodiment of the rivet; and

FIG. 32 is a sectional view of the sprinkler nozzle shown in FIG. 28.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The sprinkler nozzle according to the present invention consists of a rivet and a pin to be inserted thereinto. This combination can be classified into 2 groups, that is to say, Group (a) a combination of the standard type rivet and the pin having an enlarged head of relatively large diameter, and Group (b) a combination of the standard type pin and the rivet having an enlarged head of relatively large diameter. The Group (a) is subdivided into (i) a combination of the standard type rivet and the pin provided with straight or curved U- shaped grooves or projected lines or parts extending axially on the outer periphery thereof, and (ii) a combination of the standard type pin and the rivet provided with straight or curved U-shaped grooves or projected lines or parts extending axially on the inner wall of a hole (which will be explained later) of the rivet and (iii )standard type. The Group (12) includes (i) standard type, and (ii) a combination of the standard pin and the rivet provided with straight or curved U-shaped grooves or projected lines or parts extending axially on the outer periphery of the trunk (which will be explained later) of the rivet.

The Group (a) using the pin having an enlarged head The Group (a) is shown in FIG. 3 through FIG. 22. The similar parts such as the rivet, pin, water pipe and parts thereof are indicated by the similar reference numbers. The rivet belonging to the Group (a) consists of the trunk 2 provided with the disk or plate-shaped head 1 of relatively small diameter with the trunk having a cylindrical hole of an adequate depth therein. The above trunk 2 has several open-ended slits 5 extending axially from its tip 2a toward its head I. Said openended slits 5 extend from the tip 2a of the trunk to a certain adequate depth beyond the bottom 4 of said hole 3. By cutting the open-ended slits 5, several securing pieces 6 are provided for fixing the trunk 2 of the rivet to the wall of the water pipe (a water distribution pipe).

On the other hand, the pin P of the sprinkler nozzle belonging to the above Group (a) has a stem 7 whose diameter is so determined as to provide an adequate gap between the outer surface of the pin and the inner surface of the hole 3 of the rivet stem R. The head of the above pin stem 7 has an enlarged head 8 of relatively large diameter. The lower face of the head 8 continues to the pin stem 7 with a continuous curved face 8a. The tip 7a of the pin P may be formed as a sharp point. as shown in FIGS. 3 and 6. However, the pin P will be more surely engaged with the securing pieces 6 of the rivet, by forming a spherical swollen portion 13 at the lower end of the stem as shown in FIG. 10 and other FIGS., or by forming a ring groove 13a at the lower end of the pin stem with or without the spherical swollen portion as especially shown in FIG. 14.

FIG. 3 shows the standard type of the sprinkler nozzle belonging to the Group (a). The above sprinkler nozzle according to the present invention, namely the combination of the rivet R and the pin P, is fitted to a water pipe as follows; as shown in FIG. 5, a fitting hole 90 to which the stem 2 of the rivet R is fitted is bored in the wall of the water pipe 9, then the rivet stem R is fitted to the fitting hole. The pin P is fitted to the hole 3 of the rivet R. and the enlarged head 8 is pushed in by the finger or other means, whereby the tip 7a of the pin pushes open the open-ended securing pieces 6. When the pin is pushed in to an adequate depth in the pin stem 7, the outer periphery of the securing pieces 6 of the rivet R is firmly engaged with the lower end of the fitting hole 9a of the water pipe 9, and at the same time. the pin P is gripped strongly by the inner wall of the securing pieces 6 of the rivet R. Thus, the sprinkler nozzle according to the present invention is completely fitted to the water pipe.

Under this condition, when water is supplied to the water pipe 9 under high pressure, water comes into the hole 3 through the enlarged open-ended slits 5 of the rivet stem. and rises through the gap between the pin stem 7 of the pin P and the hole 3. Thus water gushes out upward vertically out of the head of the rivet R along the pin stem 7. The gushed water is directed downward gradually along the curved face 8a formed on the underface of the enlarged head 8 of the pin P to be sprinkled in all directions along the whole periphery of the lower edge of the head 8.

The Group (a)-(i) using a pin having straight and curved U-shaped groove or projected lines or parts extending axially on periphery thereof.

Dlfferent from the pin P shown in FIG. 3, the pin P of FIG. 6 has 2 opposite straight U-shaped grooves 10 and 10 extending axially on the side of the pin stem 7. Since the same rivet as above is used, this type of sprinkler nozzle can be fitted to the water pipe 9 in the same manner as shown in FIG. 8. As shown in FIG. 9, except for the grooves 10 and 10, the diameter of the pin stem 7 is almost the same as that of the hole 3 of the rivet R. Accordingly, high pressure water in the water pipe comes through the open-ended slits 5 and 5 and rises through the gap between the above U-shaped grooves 10 and 10 and the hole of the rivet 3 to gush out from the head of the rivet. The gushed water further rises through the Ushaped grooves 10 and 10 on the pin stem and spouts along the curved face 8a formed on the underface of the enlarged head 8 of the pin to gush out in a fan form from the lower end of the enlarged head 8 on the side where the U-shaped grooves 10 and 10 are arranged. That is to say, the pin shown in FIG. 6 has an advantage to sprinkle Water only on the sides of the sprinkler where the U-shaped grooves are provided. In other words, the pin shown in FIG. 6 has directional properties.

FIG. 10 shows a pin having U-shaped groove 11 which are greater in number than those on the pin shown in FIG. 6 and a spherical swollen portion 13 at the lower end of the pin stem 7. Accordingly, when this pin is fitted to the hole 3 of the rivet R secured in the fitting hole 9a of the water pipe 9 and the head 8 is pushed in, the securing pieces 6 are made to extend by the spherical swollen portion 13, to urge the outer periphery of the securing pieces 6 against the lower edge of the fitting hole 9a of the water pipe in order to finally engage the inner ends of the securing pieces 6 of the rivet R to the upper edge of the spherical swollen portion 13 whereby the fitting between the sprinkler nozzle and the water pipe is more ensured, as shown in FIG. 12.

High pressure water supplied from the water pipe to the sprinkler nozzle flows in the same manner as in the sprinkler nozzle shown in FIG. 8. However, since this pin has more U-shaped grooves than those of FIG. 8, water is sprinkled in all directions along the whole periphery of the nozzle, showing no directional property.

Like the pin shown in FIG. 10, the pin P shown in FIG. 11 has a spherical swollen portion 13 at the lower end of the pin stem. However, the pin of FIG. 11 has curved U-shaped grooves extending axially (spirally) on the pin stem 7. In a sprinkler nozzle using the above type of pin, high pressure water supplied from the water pipe to the nozzle comes through the open-ended It) through FIG. M only in that an axiallyextending straight projected lines 14 (FIGS. 15 and 16) and projected parts (FIG. 17) and curved projected lines 16 (FIG. 18) are provided on the outer periphery of the pin stem 7 of the pin P. Other structures are common in both sprinkler nozzles. In these sprinkler nozzles the diameter of the pin stem 7 having the projected lines 14 and 16 or the projected parts 15 is somewhat smaller than that of the hole 3 of the rivet R. FIG. 16 shows the sprinkler nozzle consisting of the above pin P and the rivet R fitted to the water pipe 9 in the same manner as above mentioned. High pressure water supplied from the water pipe to the sprinkler nozzle flows through the open-ended slits 5, and rises through the gap between the inner wall of the hole 3 of the rivet R and each projected line 14, I6 and each projected part 15 on the pin stem 7 to be directed downward by the curved face 8a of the pin P in order to be sprinkled in all directions from the lower edge of the enlarged head 8. In the above pins provided with the projected lines 14 and 16, the space between one projected line and the other projected line is wider than the width of the above U- shaped grooves Ill and 12. Therefore, the width of the water passage leading from the open-ended slits to the curved surface 8a of the pin P is wider than that of the sprinkler nozzles provided with the U-shaped grooves Ill and 12 as shown in FIG. through FIG. 14. This means that sprinkling amount of the former is larger than that of the latter. However, both show almost the same sprinkling pattern. The sprinkler nozzle shown in FIGS. 15 and 16 corresponds to that shown in FIGS. 10 and 12, the sprinkler nozzle shown in FIG. 18 corresponding to that shown in FIG. I

The sprinkler nozzle shown in FIG. 17 is almost similar to the standard type'sprinkler nozzle shown in FIG. 3 through FIG. 5 in operation, since the projected parts 15 on the pin stem 7 only acts to maintain the gap between the outer periphery of the pin stem 7 (excluding the projected part 15) and the inner wall of the hole 3 of the rivet R constant.

The Group (a)(ii) using a pin having straight or curved U-shaped grooves or projected lines or parts extending axially on the inner wall of hole of rivet FIG. 21 shows an embodiment of the sprinkler nozzle according to the present invention having axially extending straight U-shaped grooves 17 on the inner wall of the hole 30f the rivet R. Similarlv, FIG. 22 shows an embodiment of the sprinkler nozzle of this invention having straight projected lines 18 on the inner wall of the hole 3 of the rivet R. In this case, 2 or more of the U-shaped grooves or projected lines 18 can be used. For the above rivet R, the standard type of pin P shown in FIG. 3 through FIG. 5 is used. The diameter of the pin stem 7 of the above sprinkler nozzle is somewhat smaller than the internal diameter (When the U-shaped grooves are provided as shown in FIG. 22) or the diameter of the circle at the end of the projected lines (or projected parts) 18 (when the projected parts, etc. are provided as shown in FIG. 22). The function of the above rivet is almost the same as that of the pin 7'provided with the U-shaped grooves, or projected lines or pans. However, different from the case that the U- shaped grooves are provided on the pin stem 7 the sprinkle pattern will be disturbed due to its shorter grooves or projected lines, etc. on the inner wall of the rivet.

The Group (b) using a rivet having an enlarged head of relatively large diameter FIGS. 23 through FIG. 32 show sprinkler nozzles having axially extending straight or curved U-shaped grooves, projected lines or parts on the outer periphery of the trunk of the rivet. This type of sprinkler nozzle will be explained below. In the above drawings, unless otherwise indicated, the same reference numbers are used for the same parts as shown in FIG. 3 through FIG. 22.

A rivet R belonging to the Group (b) has a head of relatively large diameter and a continuous curved surface 19a covers between the underface thereof and the trunk 2. Like the rivet R of the Group (a), a hole 3 extends from the head 19 to the trunk 2, and at the same time several open-ended slits 5 are provided axially from the tip 2a of the trunk toward the head 19. The open-ended slits 5 extend from the trunk tip 2a to some depth beyond the bottom 4 of the above mentioned hole 3. Several securing pieces 6 for fixing the nozzle on the wall of a water pipe are provided on the trunk 2 by providing the open-ended slits 5.

On the other hand, the pin P belonging to the Group (b) has a stem 7 of diameter to fit to the hole 3 of the rivet R, and the diameter of the head 8 thereof is the same as or somewhat larger than that of the pin stem 7, as shown in FIGS. 23, 26, 28 and 32. As explained above with respect to the Group (a), the pin stem 7 has a spherical swollen portion 13 at its lower end (FIGS. 23 and 28), or is provided with the ring groove 13a which guarantees sure engagement between the pin and the rivet above the spherical swollen portion (FIGS. 26 and 32).

The sprinkler nozzle shown in FIG. 23 through FIG. 26 has the above rivet R provided with axially extending eight straight U-shaped grooves along its outer periphery ranging from the trunk 2 of the rivet R to the curved portion 19a.

The combination of the above rivet R and the above pin P, namely this sprinkler nozzle of the present invention can be fitted by the same way as repeatedly explained with respect to the Group (a). That is to say, as shown in FIG. 26, a fitting hole 9a having diameter slightly larger than that of the external diameter of the trunk 2 of the rivet R is bored in a water pipe 9. The trunk 2 of the rivet R is inserted into the above fitting hole 9a. Then the pin P is fitted to the hole 3 of the rivet R. When the pin P is further pushed, the securing pieces 6 of the rivet R are opened by the tip of the pin P to urge the outerperiphery of the securing pieces 6 against the lower edge of the hole 9a on the wall of the water pipe, in order to finally engage the inner end of the securing pieces 6 with the ring groove 1321 as shown in FIG. 26. Thus the sprinkler nozzle of the Group (b) type according to the present invention is completely fitted to the water pipe.

High pressurewater in the water pipe 9 flows into the sprinkler nozzle through the gap between the hole edge 9a and the U-shaped grooves 26 and gushes upward through the U-shaped grooves 20 and is directed downward along the curved surface 19a to be sprinkled in all directions from the lower edge of the enlarged head 19. Different from the rivet R shown in FIGS. 23, 24 and 26, the rivet R shown in FIG. 27 has curved (spiral) U- shaped grooves 21 extending axially along its outer periphery. The pin P shown in FIGS. 23 and 26 can be used with the rivet R shown in FIG. 27. The sprinkler nozzle of this type can be fitted to the wall of a water pipe in the same manner as shown in FIG. 26. High pressure water in a water pipe enters the sprinkler nozzles through a gap between the edge of the hole 9a and the curved U-shaped grooves 21, and rises through the grooves 21 spirally and is directed downward along the curved surface 19a to be sprinkled from the lower edge of the enlarged head. The sprinkler nozzle of this type sprinkles water farther than the sprinkler nozzle shown in FIG. 26 does.

Different from the nozzle shown in FIG. 23 through FIG. 26, the nozzle shown in FIG. 28 through FIG. 30 and FIG. 32 employs a rivet R having 8 straight projected lines 22 on the periphery thereof. The pin P shown in FIGS. 23 and 26 can be used with this type of rivet. The sprinkler nozzle consisting of the above mentioned rivet R and the pin P can be fitted to a water pipe in the same manner, procedure and order as shown in FIG. 23 through FIG. 26. Therefore reference should be made to the above concerned paragraph, if necessary.

When high pressure water is supplied to the water pipe, such water enters the sprinkler nozzle through a gap between the above projected lines 22 and the edge of the fitting hole 9a, and rises along each projected line and is directed downward along the curved face 19a to be sprinkled from the lower edge of the enlarged head 19.

Different from the rivet R shown in FIG. 27, the rivet R shown in FIG. 31 has eight curved (spiral shaped) projected lines 23 on the inner surface thereof. The pin P shown in FIGS. 23, 26, 28 and 32 can be used with the above mentioned rivet R. The sprinkler nozzle consisting of the above rivet and the pin can be fitted to a water pipe in the same manner, procedure and order as shown in FIG. 28 through FIG. 30 and FIG. 32. High pressure water supplied to a water pipe is sprinkled through the sprinkler nozzle in almost the same manner as the sprinkler nozzle does as explained above with reference to FIG. 28 through FIG. 30 and FIG. 32. However this sprinkler nozzle sprinkles water spirally as the sprinkler nozzle shown in FIG. 27 does.

It will thus be seen that the objects set forth above, among those made apparent from the preceding description, are efficiently attained and, since certain changes may be made in the above article without departing from the spirit and scope of the invention, it is intended that all matter contained in the above description and shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

It is also to be understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which, as a matter of language, might be said to fall therebetween.

What is claimed is:

l. A sprinkler nozzle comprising a rivet and a pin for insertion thereinto; said rivet having a cylindrical trunk, a tip end and a head end, a blind hole extending therein from the head end thereof and a plurality of grooves in said trunk from the tip end thereof to a position beyond the bottom of said blind hole to provide passageways to said blind hole and to define securing means for fixing said rivet through an aperture in a water pipe; said pin having a head and a shank, said shank diameter being of a size to be receivable in said blind hole, said shank having a length greater than the depth of said blind hole whereby to insure expansion of said securing means when said pin is inserted into said rivet, said head being of relatively large diameter as compared with said shank and having a continuous curved outer face between the top of said head and the surface of said shank.

2. A sprinkler nozzle according to the claim 1, wherein said pin has at least two straight or curved U- shaped grooves extending axially on the outer periphery thereof.

3. A sprinkler nozzle according to the claim 1, wherein said pin has at least two straight of curved projecting ribs extending axially on the outer periphery thereof.

4. A sprinkler nozzle according to the claim 1, wherein said rivet has at least two straight or curved U- shaped grooves extending axially on the innergwall of said blind hole thereof.

5. A sprinkler nozzle according to the claim 1, including a rivet having 2 or more of straight and curved projected lines or parts extending axially on the inner surface of said blind hole therein.

6. A sprinkler nozzle comprising a rivet and a pin for insertion thereinto; said rivet having a head end, a tip end and a cylindrical trunk, a blind hole extending therein from the head end thereof and a plurality of grooves in said trunk from the tip end thereof to a position beyond the bottom of said blind hole whereby to define securing means for fixing said rivet through an aperture in a water pipe; said pin having a shank, said shank diameter being of a size to be receivable in said blind hole, said shank having a length greater than the depth of said blind hole whereby to insure expansion of said securing means when said pin is inserted into said rivet; and said rivet further including a head of relatively large diameter as compared with said trunk and having a continuous curved outer face between the top of said head and the surface of said shank.

7. A sprinkler nozzle according to the claim 6, wherein said rivet has at least two straight or curved U- shaped grooves extending axially on the outer periphery thereof.

8. A sprinkler nozzle according to the claim 6, wherein said rivet has at least two straight or curved projecting ribs extending axially on the outer periphery of the trunk thereof.

9. A sprinkler nozzle according to the claim 1 wherein said pin is provided at the tip end thereof with shoulder means for engagement with said securing means.

10. A sprinkler nozzle according to the claim 6 wherein said pin is provided at the tip end thereof with shoulder means for engagement with said securing means. 

1. A sprinkler nozzle comprising a rivet and a pin for insertion thereinto; said rivet having a cylindrical trunk, a tip end and a head end, a blind hole extending therein from the head end thereof and a plurality of grooves in said trunk from the tip end thereof to a position beyond the bottom of said blind hole to provide passageways to said blind hole and to define securing means for fixing said rivet through an aperture in a water pipe; said pin having a head and a shank, said shank diameter being of a size to be receivable in said blind hole, said shank having a length greater than the depth of said blind hole whereby to insure expansion of said securing means when said pin is inserted into said rivet, said head being of relatively large diameter as compared with said shank and having a continuous curved outer face between the top of said head and the surface of said shank.
 2. A sprinkler nozzle according to the claim 1, wherein said pin has at least two straight or curved U-shaped grooves extending axially on the outer periphery thereof.
 3. A sprinkler nozzle according to the claim 1, wherein said pin has at least two straight of curved projecting ribs extending axially on the outer periphery thereof.
 4. A sprinkler nozzle according to the claim 1, wherein said rivet has at least two straight or curved U-shaped grooves extending axially on the inner wall of said blind hole thereof.
 5. A sprinkler nozzle according to the claim 1, including a rivet having 2 or more of straight and curved projected lines or parts extending axially on the inner surface of said blind hole therein.
 6. A sprinkler nozzle comprising a rivet and a pin for insertion thereinto; said rivet having a head end, a tip end and a cylindrical trunk, a blind hole extending therein from the head end thereof and a plurality of grooves in said trunk from the tip end thereof to a position beyond the bottom of said blind hole whereby to define securing means for fixing said rivet through an aperture in a water pipe; said pin having a shank, said shank diameter being of a size to be receivable in said blind hole, said shank having a length greater than the depth of said blind hole whereby to insure expansion of said securing means when said pin is inserted into said rivet; and said rivet further including a head of relatively large diameter as compared with said trunk and having a continuous curved outer face between the top of said head and the surface of said shank.
 7. A sprinkler nozzle according to the claim 6, wherein said rivet has at least two straight or curved U-shaped grooves extending axially on the outer periphery thereof.
 8. A sprinkler nozzle according to the claim 6, wherein said rivet has at least two straight or curved projecting ribs extending axially on the outer periphery of the trunk thereof.
 9. A sprinkler nozzle according to the claim 1 wherein said pin is provided at the tip end thereof with shoulder means for engagement with said securing means.
 10. A sprinkler nozzle according to the claim 6 wherein said pin is provided at the tip end thereof with shoulder means for engagement with said securing means. 